Christian II (1481 – 1559 ) was a Danish monarch and King of Denmark , Norway (1513 – 1523 ) and Sweden (1520 – 1521 ), under the Kalmar Union . Christian was born the son of King John of Denmark ("Kong Hans") and Christina of Saxony, at Nyborg Castle in 1481 and succeeded his father as king and regent in Denmark and Norway, where he later was to be succeeded by his uncle king Frederick I of Denmark . In Sweden he was as a result of his conquest of Sweden and his involvement in the Stockholm Bloodbath to be remembered as